KTL could refer to: KTL (band), a US duo musical project based in France, originally for the theatrical production "Kindertotenlieder" KTL (album), self-titled album by KTL Acronyms KTL ("Kansant
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc7da8c6199143dd025cb5903f7fc22c0ebd1009324a4d9be0fd31bf299b923f. Chain 2 (Bitcoin): anchored in block 953875 (2026-06-16T02:12:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/079caabb-41f0-49c0-bb46-d0b9abbc40ed.json and https://artists.proofprofile.net/proofs/artist/079caabb-41f0-49c0-bb46-d0b9abbc40ed.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Indie / Pop / Folk Compilation: October 2022
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff0100978114353821af062b276d630097230d682e2f501c381b51fc14761804. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6G2255943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e43c65fca966d2438e6abacd68ff74af114b77ef004a8340d76c8d6e0c9b723. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6F2245950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc5bf0ac2196e28d52644050b226fcb10ab94dfca47badfa136cd418b009b4a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AU2KL2000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90780b191e09dcaed2b4f1ef2ac1d600250b80cbadc3378fb0f044402d082fed. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6J2252184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2e38661b91bd13f656381264a367d53954840677e7d99ea2b095215e9be8a41. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZES92241068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb94cd329396b0fdbe403ebac4971ab229e90917ff8f3fdd75e48a711902c608. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZDA52250415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ee87a9f91e019adb00551433861e3b8ee356fd3cff6374a78c6f6e9e87f398a. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFYZ2102426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea862afc6c80af2ab0c67b33e27deabc596ea71f3c0e33d69bb6c46a52b9b411. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWZ2085636.